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Large pop up window is not fully shown.

Hi everybody:

I am testing ExtJS 4 and I am very happy with it, everything was working as expected until now.
I have acontroller action that creates a new window, and passes a view (defined as a container) as an item and then shows the created window as a pop up.

The problem is that this view is very large, and it is not fully shown, I mean it is cutted, splitted, I don't know how to explain. I need this window to be shown completelly as a pop up.